TY - GEN
T1 - Energy amplification in a parallel Blasius boundary layer flow subject to free-stream turbulence
AU - Lin, Fu
AU - Jovanović, Mihailo R.
PY - 2008
Y1 - 2008
N2 - We perform an input-output analysis of transition in boundary layers subject to free-stream turbulence, which is modeled as a stochastic excitation to the Navier-Stokes equations linearized around a parallel Blasius base flow. The second order statistics of this excitation are determined by modeling energy spectrum of the homogeneous isotropic turbulence using the linearized Navier-Stokes equations. Our variance-amplification analysis identifies the nearplate streamwise streaks as the most energetic flow structures and theoretically predicts prevailing length-scales. The results of our analysis are in good agreement with the experimental and numerical studies of the free-stream-turbulence-induced boundary layer transition.
AB - We perform an input-output analysis of transition in boundary layers subject to free-stream turbulence, which is modeled as a stochastic excitation to the Navier-Stokes equations linearized around a parallel Blasius base flow. The second order statistics of this excitation are determined by modeling energy spectrum of the homogeneous isotropic turbulence using the linearized Navier-Stokes equations. Our variance-amplification analysis identifies the nearplate streamwise streaks as the most energetic flow structures and theoretically predicts prevailing length-scales. The results of our analysis are in good agreement with the experimental and numerical studies of the free-stream-turbulence-induced boundary layer transition.
KW - Boundary layers
KW - Energy amplification
KW - Freestream turbulence
KW - Navier-Stokes equations
UR - http://www.scopus.com/inward/record.url?scp=52449087239&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=52449087239&partnerID=8YFLogxK
U2 - 10.1109/ACC.2008.4586964
DO - 10.1109/ACC.2008.4586964
M3 - Conference contribution
AN - SCOPUS:52449087239
SN - 9781424420797
T3 - Proceedings of the American Control Conference
SP - 3070
EP - 3075
BT - 2008 American Control Conference, ACC
T2 - 2008 American Control Conference, ACC
Y2 - 11 June 2008 through 13 June 2008
ER -